[Bug runtime/5637] Misaligned accesses in staprun for ia64 when stapio access denied

["wcohen at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

------- Additional Comments From wcohen at redhat dot com  2008-01-17 23:40 -------
When running the systemtap snapshot checkout 20080117 on ia64 attempt to run
test with following command:

sudo runtest --tool_opts install --tool systemtap --srcdir
/home/wcohen/stap_snap_200801141333/src/testsuite systemtap.syscall/syscall.exp

Noticed that there were reports of misaligned accesses when the tests failed:


Testing 64-bit access
Executing on host: gcc /home/wcohen/stap_snap_200801141333/src/testsuite/systemt
ap.syscall/access.c   -lm   -o /tmp/staptest15375/access    (timeout = 300)
access FAILED. output of "stap -c /tmp/staptest15375/access /home/wcohen/stap_sn
ap_200801141333/src/testsuite/systemtap.syscall/sys.stp" was:
------------------------------------------
/home/wcohen/stap_testing_200801171833/install/libexec/systemtap/stapio: Permiss
ion denied


See in the log the following:

Jan 17 17:52:44 squidward kernel: staprun(16356): unaligned access to
0x200000000235c884, ip=0x400000000000b7d0
Jan 17 17:52:44 squidward kernel: staprun(16356): unaligned access to
0x200000000235c87c, ip=0x400000000000b7e1
Jan 17 17:52:44 squidward kernel: staprun(16356): unaligned access to
0x200000000235c88c, ip=0x400000000000b7f0
Jan 17 17:52:44 squidward kernel: staprun(16356): unaligned access to
0x200000000235c894, ip=0x400000000000b800
Jan 17 17:52:44 squidward kernel: staprun(16356): unaligned access to
0x200000000235c89c, ip=0x400000000000b810

The ip address in the code match up to est15375/access    (timeout = 300)
access FAILED. output of "stap -c /tmp/staptest15375/access /home/wcohen/stap_sn
ap_200801141333/src/testsuite/systemtap.syscall/sys.stp" was:
------------------------------------------
/home/wcohen/stap_testing_200801171833/install/libexec/systemtap/stapio: Permiss
ion denied


See in the log the following:

Jan 17 17:52:44 squidward kernel: staprun(16356): unaligned access to
0x200000000235c884, ip=0x400000000000b7d0
Jan 17 17:52:44 squidward kernel: staprun(16356): unaligned access to
0x200000000235c87c, ip=0x400000000000b7e1
Jan 17 17:52:44 squidward kernel: staprun(16356): unaligned access to
0x200000000235c88c, ip=0x400000000000b7f0
Jan 17 17:52:44 squidward kernel: staprun(16356): unaligned access to
0x200000000235c894, ip=0x400000000000b800
Jan 17 17:52:44 squidward kernel: staprun(16356): unaligned access to
0x200000000235c89c, ip=0x400000000000b810

The ip address in the code match up to lines 52 and 55 in symbols.c

	/* Initialize mod. */
	memset(mod, 0, sizeof(struct _stp_module)); /* misaligned here */

	/* Copy name in and check for overflow. */
	strncpy(mod->name, name, STP_MODULE_NAME_LEN); /* misaligned here */

1) Should root be able to run or does root need to be added to /etc/groups?
2) If root can't run stapio, then staprun be more graceful and not create
unaligned accesses?


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |minor
            Summary|Misaligned accesses in      |Misaligned accesses in
                   |staprun for ia64            |staprun for ia64 when
                   |                            |stapio access denied


http://sourceware.org/bugzilla/show_bug.cgi?id=5637

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